Wbench



GEORGE C. TAFT, OF IVOROESTER, MASSACHUSETTS.

WRENCH.

Sp'eccaton of Letters Patent No. 23,798, dated April 26, 1859.

T 0 aZZ whom it may concern:

Be it known that I7 GEORGE O. TArT, of the city of VOrCester, in the Commonwealth of Massachusetts, have invented a new and useful Improved Double-Acting Screw and Rack lVrench; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, which represent a side view of my improved device.

To enable others skilled in the art, to make and use my invention, I will proceed to describe its construction and operation.

The device represented in the accompanying drawings and in the following description, is an improvement on the patent granted to me May 25th 1858. In the device then patented, the guide rod Z), was one piece with the rosette a, and workedlthrough a hole in a projection of the ferrule (Z. Thus the end of the guide rod Z), as it screwed through and projected beyond the projection of the ferrule was exposed and liable to be bruised, besides it proved to be a great inconvenience as it came in contact with and was in the way of the hand holding the handle c.

It is the object of the device now presented, to overcome the difiiculties above mentioned.

In the device which is the subject of this application and which is represented in the accompanying drawings, the guide rod is one piece with the ferrule (Z, extending from the projection c, of the said ferrule, into a corresponding hole o, in the center of rosette a, which latter is one piece with the screw rod f'. rIhe outside of the rosette a, is screw threaded and works into a rack 11 in the surface of shank Z. The screw rod f, works in the female screw j), in the sliding jaw g j, the latter being connected to the shank Z, by means of collars 7L, e'. The stationary jaw 7c,

forms the front end of the shank Z, while the rear portion of the shank is formed into a rod m, which passes through the ferrule and handle and is fastened at the rear end of the handle by a nut 7.

From the above it will be seen that no ends of the guide rod Z), are exposed and that it can never interfere with the hand taking hold of the handle. The guide rod ZJ, is of sufficient length so that its end will be yet within the hole in the rosette a, when the jaw j, has been moved up until in contact with the jaw 7c. The length of the screw rod f, is also such that it can never become detached from the female screw within the jaw g j. Thus it will be seen that all the pieces are permanently connected and that it is impossible for them to become disconnected.

The double screw device if, and a n, serves to accelerate the motion of lthe jaw g y', because, supposing the inclination of the threads of both screws a, and f, to be the same, it is evident that with each turn of the rosette, the jaw will move twice as far as if only one screw was used. Of course the screw threads of a, and f, run against each other. l

Having described my improved double acting screw and rack wrench7 IVhat I claim therein as new and desire to secure by Letters Patent, is:

The screw threaded rosette a, with its hole o, in combination with the stationary guide rod Z, rack 12, traversing male screw f, and sliding jaw g L, with its female screw p, substantially as and for the purposes set forth.

GEO. O. TAFT.

litnesses z JAMES H. BANCROFT, WVM. H. TArr. 

